1, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 1
};
int n;
- check_blockables_blocked_or_lose();
thread_mutex_lock(&modify_ldt_lock);
n=modify_ldt(0,local_ldt_copy,sizeof local_ldt_copy);
/* get next free ldt entry */
thread->tls_cookie=n;
pthread_mutex_unlock(&modify_ldt_lock);
+ /* now %fs:0 refers to the current thread. Useful! Less usefully,
+ * Linux/x86 isn't capable of reporting a faulting si_addr on a
+ * segment as defined above (whereas faults on the segment that %gs
+ * usually points are reported just fine...). As a special
+ * workaround, we store each thread structure's absolute address as
+ * as slot in itself, so that within the thread,
+ * movl %fs:SELFPTR_OFFSET,x
+ * stores the absolute address of %fs:0 into x.
+ */
+#ifdef LISP_FEATURE_SB_SAFEPOINT
+ thread->selfptr = thread;
+#endif
+
if(n<0) return 0;
+#ifdef LISP_FEATURE_GCC_TLS
+ current_thread = thread;
+#else
pthread_setspecific(specials,thread);
#endif
+#endif
#ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
/* Signal handlers are run on the control stack, so if it is exhausted
* we had better use an alternate stack for whatever signal tells us
};
int result;
- check_blockables_blocked_or_lose();
ldt_entry.entry_number=thread->tls_cookie;
thread_mutex_lock(&modify_ldt_lock);
result = modify_ldt(1, &ldt_entry, sizeof (ldt_entry));
void
os_restore_fp_control(os_context_t *context)
{
- asm ("fldcw %0" : : "m" (context->uc_mcontext.fpregs->cw));
+ if (context->uc_mcontext.fpregs)
+ asm ("fldcw %0" : : "m" (context->uc_mcontext.fpregs->cw));
}
void